WO2021246653A1 - Procédé et dispositif d'émission et de réception d'un signal dans un système de communication sans fil - Google Patents

Procédé et dispositif d'émission et de réception d'un signal dans un système de communication sans fil Download PDF

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Publication number
WO2021246653A1
WO2021246653A1 PCT/KR2021/005471 KR2021005471W WO2021246653A1 WO 2021246653 A1 WO2021246653 A1 WO 2021246653A1 KR 2021005471 W KR2021005471 W KR 2021005471W WO 2021246653 A1 WO2021246653 A1 WO 2021246653A1
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Prior art keywords
scell
pcell
carrier
terminal
search space
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PCT/KR2021/005471
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English (en)
Korean (ko)
Inventor
김영범
김태형
류현석
오진영
최승훈
Original Assignee
삼성전자 주식회사
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Priority claimed from KR1020200137762A external-priority patent/KR20210149573A/ko
Application filed by 삼성전자 주식회사 filed Critical 삼성전자 주식회사
Priority to US17/928,825 priority Critical patent/US20230217452A1/en
Priority to CN202180040023.3A priority patent/CN115769531A/zh
Publication of WO2021246653A1 publication Critical patent/WO2021246653A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals

Definitions

  • the present disclosure relates to a method and apparatus for transmitting and receiving a signal in a wireless communication system.
  • the 5G communication system or the pre-5G communication system is called a system after the 4G network (Beyond 4G Network) communication system or the LTE system after (Post LTE).
  • the 5G communication system is being considered for implementation in a very high frequency (mmWave) band (eg, such as a 60 gigabyte (60 GHz) band).
  • mmWave very high frequency
  • FD-MIMO Full Dimensional MIMO
  • array antenna analog beam-forming, and large scale antenna technologies are being discussed.
  • cloud radio access network cloud radio access network: cloud RAN
  • ultra-dense network ultra-dense network
  • D2D Device to Device communication
  • wireless backhaul moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Technology development is underway.
  • CoMP Coordinated Multi-Points
  • IoT Internet of Things
  • IoE Internet of Everything
  • M2M sensing technology
  • MTC Machine Type Communication
  • IoT an intelligent IT (Information Technology) service that collects and analyzes data generated from connected objects and creates new values in human life can be provided.
  • IoT can be applied to fields such as smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, and advanced medical service through convergence and complex between existing IT technology and various industries. have.
  • 5G communication system technologies such as sensor network, machine to machine (M2M), and MTC (Machine Type Communication) are being implemented by 5G communication technologies such as beamforming, MIMO, and array antenna.
  • 5G communication technologies such as beamforming, MIMO, and array antenna.
  • cloud radio access network cloud RAN
  • cloud RAN cloud radio access network
  • the present disclosure provides an apparatus and method for effectively providing a service in a mobile communication system.
  • 1 is a diagram illustrating a basic structure of a time-frequency resource domain of a 5G system.
  • FIG. 2 is a diagram illustrating an example of a frame structure of a 5G system.
  • FIG. 3 is a diagram illustrating another example of a frame structure of a 5G system.
  • FIG. 4 is a diagram illustrating another example of a frame structure of a 5G system.
  • FIG. 5 is a diagram illustrating a time domain mapping structure of a synchronization signal and a beam sweeping operation.
  • 6 is a diagram illustrating a random access procedure.
  • FIG. 7 is a diagram illustrating a procedure in which a terminal reports UE capability information to a base station.
  • CA 8 is a diagram illustrating the concept of carrier aggregation (CA).
  • FIG. 9 is a diagram illustrating a self carrier scheduling method in a carrier bundle.
  • FIG. 10 is a diagram illustrating a cross carrier scheduling method in a carrier bundle.
  • 11A shows an example in which LTE and 5G systems overlap in the same frequency band.
  • 11B shows an example in which LTE and 5G systems partially overlap in the frequency domain.
  • FIG. 12 is a diagram illustrating a basic structure of a time-frequency resource region of an LTE system.
  • FIG. 13 is a diagram illustrating a method for avoiding collision of LTE and 5G signals in a DSS system.
  • FIG. 14 is a diagram illustrating a search space after an initial access of a terminal in a wireless communication system according to an embodiment of the present disclosure.
  • 15 is a diagram illustrating a method of configuring an NR PDCCH search space in a wireless communication system according to an embodiment of the present disclosure.
  • 16 is a diagram illustrating a method for a UE to monitor an NR PDCCH search space in a wireless communication system according to an embodiment of the present disclosure.
  • 17 is a diagram illustrating another method of configuring an NR PDCCH search space in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 18 is a diagram illustrating another method for a UE to monitor an NR PDCCH search space in a wireless communication system according to an embodiment of the present disclosure.
  • 19 is a diagram illustrating another method of configuring an NR PDCCH search space in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 20 is a diagram illustrating another method for a UE to monitor an NR PDCCH search space in a wireless communication system according to an embodiment of the present disclosure.
  • 21 is a diagram illustrating a procedure for setting a carrier bundle in a wireless communication system according to an embodiment of the present disclosure.
  • 22 is a diagram illustrating an apparatus for transmitting and receiving a terminal in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 23 is a block diagram illustrating the configuration of a terminal according to an embodiment of the present disclosure.
  • 24 is a block diagram illustrating a configuration of a base station according to an embodiment of the present disclosure.
  • 25 is a diagram illustrating an NR PDCCH monitoring operation of a terminal according to an SCell activation command in a wireless communication system according to an embodiment of the present disclosure.
  • 26 is a diagram illustrating an NR PDCCH monitoring operation of a terminal according to an SCell deactivation command in a wireless communication system according to an embodiment of the present disclosure.
  • a method of operating a terminal in a wireless communication system receives, from a base station, configuration information related to carrier aggregation (CA), and the configuration information related to the carrier aggregation is , including information related to cross carrier scheduling between a PCell (primary cell) and a secondary cell (SCell), performing configuration related to a carrier bundle based on the configuration information related to the carrier bundle; monitoring a common search space (CSS) of the PCell on the PCell, and monitoring a UE-specific search space (USS) of the SCell on the SCell based on the performed carrier bundle-related configuration, and in the monitoring based on the PDCCH.
  • CA carrier aggregation
  • SCS common search space
  • USS UE-specific search space
  • a terminal receives configuration information related to a carrier aggregation (CA) from a base station through a transceiver and the transceiver, and the carrier
  • the configuration information related to the bundle includes information related to cross carrier scheduling between a PCell (primary cell) and a secondary cell (SCell), and based on the configuration information related to the carrier bundle, the configuration related to the carrier bundle and monitoring a common search space (CSS) of the PCell on the PCell, and monitoring a UE-specific search space (USS) of the SCell on the SCell based on the performed carrier bundle-related configuration, and It may include at least one processor that receives the PDCCH based on the monitoring through the transceiver.
  • CCS common search space
  • USS UE-specific search space
  • each block of the flowchart diagrams and combinations of the flowchart diagrams may be performed by computer program instructions.
  • These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, such that the instructions performed by the processor of the computer or other programmable data processing equipment are not described in the flowchart block(s). It creates a means to perform functions.
  • These computer program instructions may also be stored in a computer-usable or computer-readable memory which may direct a computer or other programmable data processing equipment to implement a function in a particular manner, and thus the computer-usable or computer-readable memory.
  • the instructions stored in the flow chart block(s) produce an article of manufacture containing instruction means for performing the function described in the flowchart block(s).
  • the computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to create a computer or other programmable data processing equipment. It is also possible that instructions for performing the processing equipment provide steps for performing the functions described in the flowchart block(s).
  • each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative implementations it is also possible for the functions recited in blocks to occur out of order. For example, two blocks shown one after another may in fact be performed substantially simultaneously, or it is possible that the blocks are sometimes performed in the reverse order according to the corresponding function.
  • ' ⁇ unit' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and ' ⁇ unit' performs certain roles do.
  • '-part' is not limited to software or hardware.
  • ' ⁇ ' may be configured to reside on an addressable storage medium or may be configured to refresh one or more processors. Accordingly, as an example, ' ⁇ ' indicates components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables.
  • components and ' ⁇ units' may be combined into a smaller number of components and ' ⁇ units' or further separated into additional components and ' ⁇ units'.
  • components and ' ⁇ units' may be implemented to play one or more CPUs in a device or secure multimedia card.
  • ' ⁇ part' may include one or more processors.
  • a term for identifying an access node used in the following description a term referring to network entities, a term referring to messages, a term referring to an interface between network objects, and various identification information Reference terms and the like are exemplified for convenience of description. Accordingly, the present disclosure is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.
  • a physical channel and a signal may be used interchangeably with data or a control signal.
  • a physical downlink shared channel (PDSCH) is a term that refers to a physical channel through which data is transmitted, but the PDSCH may also be used to refer to data. That is, in the present disclosure, the expression 'transmitting a physical channel' may be interpreted equivalently to the expression 'transmitting data or a signal through a physical channel'.
  • higher signaling refers to a signal transmission method in which a base station is transmitted to a terminal using a downlink data channel of a physical layer or from a terminal to a base station using an uplink data channel of a physical layer.
  • Upper signaling may be understood as radio resource control (RRC) signaling or media access control (MAC) control element (CE).
  • RRC radio resource control
  • MAC media access control
  • gNB may be used interchangeably with eNB for convenience of description. That is, a base station described as an eNB may represent a gNB. Also, the term terminal may refer to mobile phones, MTC devices, NB-IoT devices, sensors, as well as other wireless communication devices.
  • the base station is at least one of gNode B (gNB), eNode B (eNB), Node B, BS (Base Station), radio access unit, base station controller, or a node on the network.
  • the terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function.
  • UE user equipment
  • MS mobile station
  • a cellular phone a smart phone
  • a computer or a multimedia system capable of performing a communication function.
  • multimedia system capable of performing a communication function.
  • 5G a next-generation communication system after LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)) and LTE-A (LTE-Advanced or E-UTRA Evolution) to handle the recently explosively increasing mobile data traffic (5 th Generation) system or New Radio access technology (NR) initial standard has been completed.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced or E-UTRA Evolution
  • eMBB enhanced Mobile BroadBand
  • Ultra-Reliable and Low Low
  • It aims to satisfy various services and requirements, such as Latency Communication (URLLC) service and massive MTC (Machine Type Communication) service that supports mass communication of things.
  • URLLC Latency Communication
  • massive MTC Machine Type Communication
  • the 5G system In contrast to the existing LTE and LTE-A system transmission bandwidth per single carrier is limited to a maximum of 20 MHz, the 5G system aims to provide ultra-high-speed data services up to several Gbps by utilizing a much wider ultra-wide bandwidth. Accordingly, the 5G system considers the ultra-high frequency band from several GHz up to 100 GHz, which is relatively easy to secure, as a candidate frequency. Additionally, it is possible to secure a wide bandwidth frequency for the 5G system through frequency relocation or allocation among the frequency bands included in the hundreds of MHz to several GHz used in the existing mobile communication system.
  • the radio wave in the very high frequency band has a wavelength of several millimeters and is also called millimeter wave (mmWave).
  • mmWave millimeter wave
  • the pathloss of radio waves increases in proportion to the frequency band, so that the coverage of the mobile communication system becomes small.
  • a beamforming technology is applied to increase the reach of radio waves by concentrating the radiant energy of radio waves to a predetermined target point using a plurality of antennas. That is, in the signal to which the beamforming technology is applied, the beam width of the signal is relatively narrowed, and the radiation energy is concentrated within the narrowed beam width to increase the radio wave arrival distance.
  • the beamforming technique can be applied to a transmitter and a receiver, respectively. In addition to the effect of increasing the coverage, the beamforming technique has an effect of reducing interference in a region other than the beamforming direction. In order for the beamforming technology to operate properly, an accurate measurement and feedback method of a transmit/receive beam is required.
  • the beamforming technique can be applied to a control channel or a data channel corresponding to a one-to-one between a predetermined terminal and a base station.
  • the base station transmits a common signal to a plurality of terminals in the system, for example, a synchronization signal, a physical broadcast channel (PBCH), a control channel and a data channel for transmitting system information.
  • Beamforming technology can also be applied to increase coverage.
  • the beam sweeping technology which transmits the signal by changing the beam direction, is additionally applied so that the common signal can be reached to the terminal located at any position in the cell. do.
  • an ultra-low latency service with a transmission delay of about 1 ms between the transmitting and receiving ends is required.
  • TTI Transmission Time Interval
  • the TTI is a basic time unit for performing scheduling, and the TTI of the existing LTE and LTE-A systems is 1 ms corresponding to the length of one subframe.
  • 0.5 ms, 0.25 ms, 0.125 ms, etc. shorter than the existing LTE and LTE-A systems are possible.
  • the present disclosure relates to a method and apparatus for transmitting and receiving a terminal in a wireless communication system to which carrier aggregation (CA) is applied.
  • CA carrier aggregation
  • the present disclosure relates to a cellular wireless communication system, and to a method of transmitting and receiving a control channel and a data channel of a terminal performing a carrier bundling operation.
  • the present disclosure may provide a method of resolving a scheduling constraint due to a lack of radio resources in a mobile communication system.
  • the present disclosure defines a method for scheduling a UE in a mobile communication system supporting carrier aggregation (CA), thereby solving a problem of insufficient cell capacity that may occur in a given cell.
  • CA carrier aggregation
  • FIG. 1 is a diagram illustrating a basic structure of a time-frequency resource domain of a 5G system. That is, FIG. 1 is a diagram illustrating the basic structure of a time-frequency resource region, which is a radio resource region in which data or control channels of a 5G system are transmitted.
  • the horizontal axis represents the time domain
  • the vertical axis represents the frequency domain.
  • the minimum transmission unit in the time domain of the 5G system is an OFDM (Orthogonal Frequency Division Multiplexing) symbol, (102) symbols are gathered to form one slot 106, Slots may be gathered to configure one subframe 105 .
  • the length of the subframe is 1.0ms, and 10 subframes may be gathered to form a 10ms frame 114 .
  • the minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth may be composed of a total of N BW 104 subcarriers.
  • a basic unit of a resource in the time-frequency domain is a resource element (RE) 112 and may be represented by an OFDM symbol index and a subcarrier index.
  • the base station may map data in units of RBs, and in general, may perform scheduling on RBs constituting one slot for a given terminal. That is, in the 5G system, a basic time unit for scheduling may be a slot, and a basic frequency unit for scheduling may be an RB.
  • Number of OFDM symbols is determined according to the length of a Cyclic Prefix (CP) added to each symbol to prevent inter-symbol interference.
  • CP Cyclic Prefix
  • the extended CP is applied to a system having a relatively longer radio transmission distance than the general CP, so that orthogonality between symbols can be maintained.
  • the overhead due to the CP may be maintained constant regardless of the subcarrier interval. That is, if the subcarrier interval is small, the symbol length may be increased, and accordingly, the CP length may also be increased. Conversely, if the subcarrier spacing is large, the symbol length may be shortened, and accordingly, the CP length may be reduced.
  • the symbol length and the CP length may be inversely proportional to the subcarrier spacing.
  • various frame structures can be supported by adjusting the subcarrier interval in order to satisfy various services and requirements. For example,
  • the symbol length in the time domain is shortened and, as a result, the slot length is shortened, which is advantageous to support ultra-low latency services such as URLLC.
  • a cell is a concept indicating an area covered by one base station in mobile communication.
  • the subcarrier spacing, CP length, etc. are essential information for OFDM transmission/reception, and smooth transmission/reception is possible only when the base station and the terminal recognize them as mutually common values.
  • [Table 1] shows the subcarrier spacing configuration supported by the 5G system. ), subcarrier spacing ( ), representing the relationship between CP lengths.
  • [Table 2] shows the subcarrier interval setting ( ), the number of symbols per slot ( ), the number of slots per frame ( ), the number of slots per subframe ( ) appears.
  • Table 3 shows the subcarrier interval setting ( ), the number of symbols per slot ( ), the number of slots per frame ( ), the number of slots per subframe ( ) appears.
  • FIG. 2 is a diagram illustrating an example of a frame structure of a 5G system. That is, FIG. 2 shows a 5G frame structure such as a frame structure of LTE/LTE-A or a set of essential parameters.
  • one slot may constitute one subframe, and ten subframes may constitute one frame.
  • FIG. 3 is a diagram illustrating another example of a frame structure of a 5G system.
  • FIG. 4 is a diagram illustrating another example of a frame structure of a 5G system.
  • PRB physical resource block
  • the essential parameter sets such as subcarrier interval, CP length, slot length, etc. have an integer multiple relationship for each frame structure, so that high scalability can be provided.
  • a subframe having a fixed length of 1 ms may be defined to indicate a reference time unit independent of the frame structure.
  • the frame structure illustrated in FIGS. 2 to 4 may be applied to correspond to various scenarios.
  • a larger cell can be supported as the CP length is longer, so that the frame structure of FIG. 2 can support a cell relatively larger than the frame structure of FIGS. 3 and 4 .
  • the shorter the slot length which is the basic time unit of scheduling, the better. .
  • uplink means a radio link in which a terminal transmits data or control signals to a base station
  • downlink is a method in which a base station transmits data or control signals to a terminal. It may mean a wireless link.
  • the terminal In the initial access stage when the terminal first accesses the system, the terminal synchronizes downlink time and frequency from a synchronization signal transmitted by the base station through cell search, and performs cell ID (cell search). ID) can be obtained.
  • the UE may receive a PBCH (Physical Broadcast Channel) by using the obtained cell ID, and may obtain MIB (Master Information Block), which is essential system information, from the PBCH.
  • the terminal may receive system information (SIB) transmitted by the base station to obtain control information related to transmission and reception common to the cell.
  • SIB system information
  • the cell common transmission/reception related control information may include random access related control information, paging related control information, common control information for various physical channels, and the like.
  • a synchronization signal is a reference signal for cell search, and subcarrier spacing may be applied to suit a channel environment, such as phase noise, for each frequency band.
  • a subcarrier interval may be differently applied according to a service type.
  • FIG. 5 is a diagram illustrating a time domain mapping structure of a synchronization signal and a beam sweeping operation.
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal: It serves as a standard for DL time/frequency synchronization and provides cell ID information. Additionally, it may serve as a reference signal for demodulation of the PBCH.
  • - PBCH Physical Broadcast Channel
  • MIB Master Information Block
  • the essential system information includes search space related control information indicating radio resource mapping information of a control channel, scheduling control information for a separate data channel for transmitting system information, and SFN (System System) which is a frame unit index serving as a timing reference. frame number) and the like.
  • the base station can transmit a maximum of L SS/PBCH blocks, and the L SS/PBCH blocks are mapped within a half frame (0.5 ms).
  • the L SS/PBCH blocks are periodically repeated in units of a predetermined period P. The period P may be notified by the base station to the terminal through signaling. If there is no separate signaling for the period P, the terminal applies a preset default value.
  • FIG. 5 shows that beam sweeping is applied in units of SS/PBCH blocks according to the passage of time.
  • the SS/PBCH block is received with a beam radiated in the #d0 503 direction by beamforming applied to the SS/PBCH block #0 at time t1 501 .
  • UE2 506 receives the SS/PBCH block with a beam radiated in the direction #d4 504 by beamforming applied to SS/PBCH block #4 at time t2 502 .
  • the terminal may obtain an optimal synchronization signal through a beam radiated from the base station in the direction in which the terminal is located. For example, it may be difficult for UE1 505 to obtain time/frequency synchronization and essential system information from the SS/PBCH block through a beam radiated in the #d4 direction away from the position of UE1.
  • the UE may receive the SS/PBCH block to determine whether radio link quality of the current cell is maintained at a predetermined level or more.
  • the UE may receive the SS/PBCH block of the neighboring cell in order to determine the radio link quality of the neighboring cell and obtain time/frequency synchronization of the neighboring cell.
  • the terminal After the terminal acquires MIB and system information from the base station through an initial access procedure, the terminal performs a random access procedure to switch the link with the base station to a connected state (connected state or RRC_CONNECTED state). can be done Upon completion of the random access procedure, the terminal is switched to a connected state, and one-to-one communication is enabled between the base station and the terminal.
  • a random access procedure will be described in detail with reference to FIG. 6 .
  • 6 is a diagram illustrating a random access procedure.
  • the terminal transmits a random access preamble to the base station.
  • the random access preamble which is the first message transmitted by the UE, may be referred to as message 1.
  • the base station may measure a transmission delay value between the terminal and the base station from the random access preamble and achieve uplink synchronization.
  • the UE may arbitrarily select which random access preamble to use in the random access preamble set given by the system information in advance.
  • the initial transmission power of the random access preamble may be determined according to the pathloss between the base station and the terminal measured by the terminal.
  • the terminal can transmit the random access preamble by determining the transmission beam direction of the random access preamble from the synchronization signal received from the base station.
  • the base station transmits an uplink transmission timing adjustment command to the terminal from the transmission delay value measured from the random access preamble received in the first step 610 .
  • the base station may transmit an uplink resource and a power control command to be used by the terminal as scheduling information. Control information for an uplink transmission beam of the terminal may be included in the scheduling information.
  • the terminal does not receive a random access response (RAR) (or message 2), which is scheduling information for message 3, from the base station within a predetermined time in the second step 620, the first step 610 can proceed again. If the first step 610 is performed again, the terminal increases the random access preamble transmission power by a predetermined step and transmits it (power ramping), thereby increasing the random access preamble reception probability of the base station.
  • RAR random access response
  • the terminal transmits uplink data (message 3) including its terminal ID to the base station using the uplink resource allocated in the second step 620 to an uplink data channel (Physicla Uplink Shared Channel, PUSCH). ) through the The transmission timing of the uplink data channel for transmitting Message 3 may follow the timing control command received from the base station in step 620 . In addition, the transmission power of the uplink data channel for transmitting Message 3 may be determined in consideration of the power control command received from the base station in the second step 620 and the power ramping value of the random access preamble.
  • the uplink data channel for transmitting Message 3 may mean the first uplink data signal transmitted by the terminal to the base station after the terminal transmits the random access preamble.
  • step 640 when the base station determines that the terminal has performed random access without collision with other terminals, data (message 4) including the ID of the terminal that transmitted the uplink data in the third step 630 is transmitted. transmitted to the corresponding terminal.
  • the terminal may determine that the random access is successful.
  • the UE may transmit HARQ-ACK information indicating whether the message 4 has been successfully received to the eNB through a Physical Uplink Control Channel (PUCCH).
  • PUCCH Physical Uplink Control Channel
  • the base station may not transmit any more data to the terminal. Accordingly, if the terminal fails to receive the data transmitted from the base station in the fourth step 640 within a predetermined time, it may determine that the random access procedure has failed and start again from the first step 610 .
  • the terminal When the random access procedure is successfully completed, the terminal is switched to a connected state, and one-to-one communication between the base station and the terminal can be enabled.
  • the base station may receive UE capability information from the connected terminal and adjust scheduling with reference to the UE capability information of the corresponding terminal.
  • the terminal may inform the base station of whether the terminal itself supports a predetermined function, the maximum allowable value of the function supported by the terminal, and the like, through the UE capability information. Accordingly, the UE capability information reported by each terminal to the base station may be a different value for each terminal.
  • the UE may report UE capability information including at least a part of the following control information as the UE capability information to the base station.
  • bandwidth-related control information When carrier aggregation (CA) is supported, bandwidth-related control information
  • FIG. 7 is a diagram illustrating a procedure in which a terminal reports UE capability information to a base station.
  • the base station 702 may transmit a UE capability information request message to the terminal 701 .
  • the terminal transmits UE capability information to the base station in step 720 .
  • Downlink control information is control information transmitted from a base station to a terminal through downlink, and may include downlink data scheduling information or uplink data scheduling information for a predetermined terminal.
  • the base station can independently channel-code DCI for each terminal, and then transmit it to each terminal through a physical downlink control channel (PDCCH), which is a downlink physical control channel.
  • PDCCH physical downlink control channel
  • the base station is scheduling information for downlink data (Downlink assignment), scheduling information for uplink data (Uplink grant), and spatial multiplexing using multiple antennas for a terminal to be scheduled , it is possible to apply and operate a predetermined DCI format according to the purpose, such as whether it is DCI for power control.
  • the base station may transmit downlink data to the terminal through a Physical Downlink Shared Channel (PDSCH), which is a physical channel for downlink data transmission.
  • PDSCH Physical Downlink Shared Channel
  • Scheduling information such as a specific mapping position, modulation method, HARQ-related control information, and power control information in the time and frequency domain of the PDSCH is transmitted from the base station to the terminal through the DCI related to the downlink data scheduling information among the DCI transmitted through the PDCCH. can tell you
  • the UE may transmit uplink data to the base station through a Physical Uplink Shared Channel (PUSCH), which is a physical channel for uplink data transmission.
  • PUSCH Physical Uplink Shared Channel
  • Scheduling information such as a specific mapping position, modulation method, HARQ-related control information, and power control information in the time and frequency domain of PUSCH will be notified to the UE by the base station through DCI related to uplink data scheduling information among DCIs transmitted through the PDCCH.
  • the ultra-wide bandwidth signal transmission and reception may be supported through a single component carrier (CC) or through a carrier aggregation (CA) technology combining multiple component carriers.
  • CC component carrier
  • CA carrier aggregation
  • carrier bundling technology when a mobile operator fails to secure a frequency of sufficient bandwidth to provide a high-speed data service with a single component carrier, each component carrier with a relatively small bandwidth size is combined to increase the total frequency bandwidth and, as a result, It can enable high-speed data service.
  • CA 8 is a diagram illustrating the concept of carrier aggregation (CA).
  • each component carrier may be divided into PCell or SCell and operated.
  • a PCell Primary Cell
  • PCC Primary Component Carrier
  • the terminal transmits UCI (Uplink Control Information), which is uplink control information including HARQ ACK/NACK that feeds back whether data received from the base station whether there is an error, or CSI indicating the channel state between the base station and the terminal, to the uplink control channel PUCCH.
  • UCI Uplink Control Information
  • PUCCH Physical Uplink Control Channel
  • SCell Secondary Cell
  • SCC Secondary Component Carrier
  • each component carrier is independent of each other, and the downlink carrier bundle and the uplink carrier bundle can be applied independently of each other.
  • a carrier bundle combining a component carrier of a 100 MHz bandwidth and two component carriers of a 50 MHz bandwidth is applied to the downlink, and only one component carrier of a 100 MHz bandwidth may be used in the uplink (that is, the carrier bundle may not be applied) Number).
  • a cell and a component carrier may be mixed and used without distinction.
  • Carrier bundle related settings such as which component carriers to combine, how many component carriers to combine, or control information related to the bandwidth of each component carrier may be notified by the base station to the terminal through signaling.
  • a method for scheduling a UE in a carrier bundle system may be classified into two types: a self carrier scheduling method and a cross carrier scheduling method.
  • FIG. 9 is a diagram illustrating a self carrier scheduling method in a carrier bundle.
  • the base station may transmit a downlink data channel (Physical Data Shared Channel, PDSCH) (eg, 905, 907) to an arbitrary terminal through CC#0 901 and CC#1 902. .
  • PDSCH Physical Data Shared Channel
  • the PDCCH 904 for scheduling the PDSCH 905 of CC#0 901 is transmitted to the UE through CC#0 901
  • a PDCCH for scheduling the PDSCH 907 of CC#1 ( 906) may be transmitted to the UE through CC#1 902.
  • a scheduling method in which a data channel and a control channel for scheduling the data channel are transmitted on the same carrier or the same cell may be referred to as self carrier scheduling.
  • FIG. 10 is a diagram illustrating a cross carrier scheduling method in a carrier bundle.
  • FIG. 10 exemplifies a system to which carrier bundle is applied to two downlink configuration carriers (CC#0 (1001) and CC#1 (1002)).
  • the base station may transmit a downlink data channel (Physical Data Shared Channel, PDSCH) (eg, 1005 and 1007) to an arbitrary terminal through CC#0 1001 and CC#1 1002.
  • PDSCH Physical Data Shared Channel
  • the PDCCH 1004 for scheduling the PDSCH 1005 of CC#0 1001 and the PDCCH 1006 for scheduling the PDSCH 1007 of the CC#1 1002 are both CC#0 (1001).
  • a data channel and a control channel for scheduling the data channel may be transmitted on different carriers or different cells.
  • Such a scheduling method may be referred to as cross carrier scheduling.
  • FIGS. 9 and 10 describe the downlink carrier aggregation technique
  • the examples of FIGS. 9 and 10 may be similarly applied to the uplink carrier aggregation technique.
  • Cross-carrier scheduling can obtain the following effects compared to self-carrier scheduling.
  • Control channel offloading When radio resources to transmit a control channel to a predetermined carrier are insufficient, the control channel may be transmitted to a separate carrier having relatively sufficient radio resources. For example, in the case of FIG. 10, if the bandwidth of CC#1 is 20 MHz and the bandwidth of CC#0 is 100 MHz, CC#0 is relatively sufficient as a radio resource for control channel transmission.
  • Control channel interference management Relatively strong interference may occur in a predetermined carrier due to factors of the surrounding environment, frequency characteristics, and the like.
  • the interference may deteriorate the transmission/reception performance of the control channel.
  • the control channel transmission/reception performance deterioration may be avoided by transmitting the control channel through a carrier having a relatively low interference effect.
  • HARQ Hybrid Automatic Repeate reQuest
  • DSS dynamic spectrum sharing
  • LTE-NR coexsistence A scenario in which LTE and 5G systems are deployed and operated in the same frequency band or frequency band in overlapping frequency bands may be referred to as dynamic spectrum sharing (DSS) or LTE-NR coexsistence.
  • DSS dynamic spectrum sharing
  • whether to schedule LTE or 5G to the UE may be adjusted according to changes in LTE traffic and 5G traffic.
  • DSS can be used to promote 5G proliferation without additional frequency allocation by maximizing existing frequencies in the early stage of 5G system installation when LTE traffic gradually decreases and 5G traffic gradually increases. From the perspective of telecommunication service providers, the DSS operation allows efficient use of frequencies that have already been secured without wasting them.
  • FIGS. 11A and 11B are diagrams illustrating the concept of Daynamic spectrum sharing (DSS).
  • 11A shows an example in which LTE and 5G systems overlap in the same frequency band.
  • the base station may determine when to schedule LTE and when to schedule 5G according to the distribution of LTE traffic and 5G traffic.
  • 11A illustrates an example in which LTE is scheduled during time period T1 and 5G is scheduled during time period T2.
  • 11B shows an example in which LTE and 5G systems partially overlap in the frequency domain.
  • LTE and 5G share time/frequency resources in both FIGS. 11A and 11B, deterioration in transmission/reception performance can be minimized by preventing LTE and 5G from collided in time/frequency resources at any moment.
  • FIG. 12 is a diagram illustrating a basic structure of a time-frequency resource region of an LTE system. That is, FIG. 12 shows a basic structure of a time-frequency domain, which is a radio resource domain in which data or a control channel is transmitted in downlink of an LTE system, and a mapping relationship between downlink physical channels and signals.
  • the subcarrier interval is generally fixed at 15 kHz regardless of the frequency band, and time-frequency resources are fixedly occupied by control channels and signals. exist.
  • the horizontal axis represents the time domain
  • the vertical axis represents the frequency domain.
  • the minimum transmission unit in the frequency domain is a subcarrier (subcarrier) 1202, the entire system transmission bandwidth (system bandwidth) (1203) is a total It may be composed of subcarriers. may have a value proportional to the system transmission band.
  • a basic unit of a resource in the time-frequency domain is a resource element (RE) 1204 and may be represented by an OFDM symbol index and a subcarrier index.
  • the LTE downlink control channel 1210 may be mapped within the first N OFDM symbol number in a subframe in the time domain and may be transmitted to the UE by being mapped over the entire system transmission band in the frequency domain.
  • the time-frequency region to which the LTE downlink control channel is mapped may be referred to as a “control region”.
  • a Physical Control Format Indicator Channel including an indicator indicating the value of N
  • a Physical Downlink Control Channel including uplink or downlink scheduling information
  • uplink data indicating success in reception
  • a Physical HARQ Indicator Channel including HARQ ACK/NACK signals.
  • the PCFICH may be mapped to the first symbol among the first N OFDM symbols of the subframe, and the PDCCH may be mapped over the N OFDM symbols.
  • the PHICH may be mapped across OFDM symbols according to a separate configuration indicated by the base station within the N OFDM symbols.
  • the LTE downlink physical data channel PDSCH (Physical Downlink Shared Channel) 1211 is mapped during the remaining subframe period in which the downlink control channel is not transmitted in the time domain, and in the frequency domain is mapped to the frequency domain indicated by the LTE PDCCH. can be transmitted.
  • PDSCH Physical Downlink Shared Channel
  • the base station may transmit a reference signal (hereinafter referred to as RS) for the UE to refer to for measuring a downlink channel state or for reference to demodulate the PDSCH.
  • the reference signal is also called a pilot signal.
  • RS supports a cell-specific reference signal (CRS) 1212 that can be jointly received by terminals in a cell, a CSI-RS that supports multiple antennas but uses relatively few resources per antenna port compared to CRS ( Channel Status Information Reference Signal) and a DMRS (Demodulation Reference Signal) referenced by the UE to demodulate a PDSCH scheduled for a predetermined UE.
  • CRS Cell-specific reference signal
  • CSI-RS Channel Status Information Reference Signal
  • DMRS Demodulation Reference Signal
  • the DMRS for the PDSCH may be mapped to a pre-arranged position in the time-frequency domain of the PDSCH scheduled by the base station.
  • the base station may control and operate the transmission period and the mapping position in the time-frequency domain.
  • the CRS it is characterized in that it is repeatedly mapped and transmitted to the RE illustrated in FIG. 12 in every subframe over the entire system transmission band.
  • Antenna port is a logical concept, and RS is defined for each antenna port and is operated to measure the channel state for each antenna port. If the same RS is transmitted from multiple physical antennas, the UE cannot distinguish each physical antenna and recognizes it as one antenna port.
  • the CRS is a cell common signal, and the UE may measure the CRS and perform the following operation.
  • the downlink channel state is determined from the CRS and then reported to the base station to support the base station scheduling.
  • the base station may transmit the CRS at a predetermined position for every subframe.
  • FIG. 13 is a diagram illustrating a method for avoiding collision of LTE and 5G signals in a DSS system.
  • the horizontal axis represents the time domain and the vertical axis represents the frequency domain, respectively.
  • LTE and 5G systems overlap each other in the frequency domain using the same frequency band.
  • both LTE and 5G systems use the same subcarrier spacing of 15 kHz.
  • LTE Long Term Evolution
  • NR NR PDCCH
  • Reference numeral 1320 denotes a basic structure of a downlink time-frequency domain of the LTE system described in FIG. 12, and indicates that a base station transmits an LTE downlink signal during a time period 1301 (LTE reference 1 subframe).
  • the LTE downlink signal may include an LTE CRS 1304 , an LTE PDCCH 1305 , and an LTE PDSCH 1306 .
  • the LTE PDCCH 1305 may include scheduling information for the LTE PDSCH 1306 .
  • the LTE “control region” is exemplified by the first 2 symbols in the subframe.
  • Reference numeral 1350 denotes a basic structure of the time-frequency domain of the 5G system described in FIG. 1 , and indicates that NR PDCCH 1308 , NR PDSCH 1309 , and NR DMRS 1307 for NR PDSCH are mapped.
  • an NR PDCCH 1308 may be mapped to the first two symbols in a slot, and an NR PDSCH 1309 scheduled by the NR PDCCH 1308 may be mapped during the remainder of the slot.
  • the NR DMRS 1307 for the NR PDSCH 1309 may be mapped to the 3rd symbol and the 10th symbol in the slot.
  • the base station may schedule and transmit the LTE PDSCH according to the structure of reference number 1320 to the LTE terminal during the time period of reference number 1301 .
  • the NR PDSCH 1309 may be scheduled and transmitted to the 5G terminal according to the structure of reference number 1360 and reference number 1370, respectively.
  • the base station may transmit LTE CRS and LTE PDCCH according to the structures of reference numbers 1330 and 1340, respectively. In this case, there may be no LTE PDSCH transmission.
  • Reference number 1340 denotes an LTE MBSFN subframe, and has a feature that the overhead of LTE CRS is relatively small compared to the general subframes of reference numbers 1320 and 1330.
  • LTE and 5G signal collision avoidance method 1 LTE CRS rate matching
  • the base station when transmitting a 5G downlink signal to a 5G terminal, the base station avoids the location of the LTE CRS and maps and transmits the 5G downlink signal (LTE CRS rate matching). In addition, the base station informs the 5G terminal of LTE CRS configuration information, so that the 5G terminal can receive the 5G downlink signal at an accurate location.
  • the LTE CRS configuration information may include the following information. The UE may know the mapping position of the LTE CRS from the LTE CRS configuration information.
  • mapping offset of LTE CRS from RB boundary in frequency domain expressed in RE units
  • LTE MBSFN subframe configuration information including the configuration period and timing offset of the LTE MBSFN subframe
  • the base station when there is no downlink data to be transmitted by the base station to the LTE terminal during the period of reference number 1302, or when the base station determines that scheduling for the 5G terminal is prioritized, the base station allocates the available radio resources to the 5G terminal.
  • the LTE system maps the LTE CRS to a predetermined location and transmits it.
  • the base station maps the NR PDSCH to a time-frequency resource other than the mapping location of the LTE CRS and transmits it.
  • the region indicated by 'x' of reference number 1312 is an RE in which LTE CRS 1304 of reference number 1320 and reference number 1330 is transmitted, and the base station maps and transmits the NR PDSCH to a region other than the corresponding RE. Since the UE needs to know the location of the LTE CRS to receive the NR PDSCH except for the RE when receiving the NR PDSCH, the UE obtains LTE CRS configuration information from the base station through signaling.
  • LTE and 5G signal collision avoidance method 2 LTE and 5G signal collision avoidance method 2: NR PDCCH mapping adjustment
  • the time-frequency resource to which the NR PDCCH, which is the downlink control channel of the 5G system, is mapped may be referred to as a control resource set (CORESET).
  • CORESET may be set to all or some frequency resources of a bandwidth supported by the UE in the frequency domain.
  • one or a plurality of OFDM symbols may be set, which may be defined as a CORESET length (Control Resource Set Duration).
  • the base station may set one or a plurality of CORESETs to the terminal through higher layer signaling (eg, system information, master information block (MIB), radio resource control (RRC) signaling).
  • MIB master information block
  • RRC radio resource control
  • Setting the CORESET to the UE may mean providing information such as a CORESET identifier, a frequency position of the CORESET, and a symbol length of the CORESET.
  • the information provided by the base station to the terminal to set the CORESET may include at least some of the information included in ⁇ Table 4>.
  • the CORESET is in the frequency domain. may be composed of RBs, and in the time domain It may be composed of ⁇ 1,2,3 ⁇ symbols.
  • the NR PDCCH may consist of one or a plurality of Control Channel Elements (CCEs).
  • CCEs may consist of 6 resource element groups (REGs), and a REG may be defined as 1 RB for 1 OFDM symbol.
  • REGs may be indexed in time-first order, starting with REG index 0 from the first OFDM symbol of CORESET, the lowest RB.
  • an interleaved method and a non-interleaved method may be supported as a transmission method for the NR PDCCH.
  • the base station may set whether to transmit interleaving or non-interleaving for each CORESET to the terminal through higher layer signaling. Interleaving may be performed in units of REG bundles.
  • a REG bundle may be defined as a set of one or a plurality of REGs.
  • the UE may determine the CCE-to-REG mapping method in the corresponding CORESET based on whether interleaving or non-interleaving transmission configured from the base station is performed in the manner shown in Table 5 below.
  • the base station may inform the terminal to which symbol the NR PDCCH is mapped in the slot and configuration information such as the transmission period through signaling.
  • the NR PDCCH 1308 may be mapped to the first two symbols in the slot and transmitted.
  • the time-frequency resource occupied by the LTE PDCCH and LTE CRS is avoided and the NR PDCCH is mapped to the third symbol in the slot by mapping (1310) LTE and 5G collisions can be avoided.
  • LTE and 5G signal collision avoidance method 3 LTE and 5G signal collision avoidance method 3: DMRS location adjustment for NR PDSCH
  • the base station sets the mapping location of the DMRS for NR PDSCH and informs the terminal by signaling. For example, in the case of reference number 1350 of FIG. 13, DMRS for NR PDSCH may be mapped to the 3rd and 10th symbols in the slot. During the reference number 1302 time interval in which LTE and 5G coexist, according to reference number 1360, the time-frequency resources occupied by LTE PDCCH and LTE CRS are avoided to avoid the 4th and 10th symbols in the slot. DMRS for NR PDSCH is mapped (1313) ), the collision between LTE and 5G can be avoided.
  • LTE and 5G signal collision avoidance method 4 LTE and 5G signal collision avoidance method 4: NR PDSCH mapping adjustment
  • the base station informs the time-frequency resource information of the NR PDSCH through the NR PDCCH scheduling the NR PDSCH.
  • the NR PDSCH may be mapped from the 3rd symbol to the 14th symbol in the slot.
  • the time-frequency resource occupied by the LTE PDCCH is avoided and the NR PDSCH is mapped from the 4th symbol to the 14th symbol in the slot.
  • mapping (1311) Collision between LTE and 5G can be avoided.
  • the NR PDSCH and the LTE CRS may be collided with each other through collision avoidance method 1 of the LTE and 5G signals.
  • LTE and 5G signal collision avoidance method 5 LTE MBSFN subframe adjustment
  • the mapping frequency of LTE CRS within the LTE MBSFN subframe is lowered and the time domain size of the LTE “control region” can be limited. That is, the LTE CRS mapping symbol of the LTE MBSFN subframe is limited to within the first 2 symbols within the subframe, and the time domain size of the LTE “control region” of the LTE MBSFN subframe may be limited within the first 2 symbols within the subframe.
  • Reference number 1340 exemplifies that the time period 1303 is set as the LTE MBSFN subframe of the LTE system.
  • the LTE CRS and LTE “control region” mapped over the first 2 symbols of the LTE MBSFN subframe may be mapped to avoid the 5G signal. That is, according to reference number 1370, the NR PDCCH is mapped to the 3rd symbol in the slot by avoiding the time-frequency resource occupied by the LTE PDCCH, and the DMRS for the NR PDSCH is mapped to the 4th and 10th symbols in the slot. Collision of the LTE and 5G signals can be avoided by mapping the NR PDSCH from the 4th symbol to the 14th symbol.
  • LTE and 5G signal collision avoidance method 6 5G uplink transmission frequency shift
  • the DSS system is a method in which LTE and 5G share time-frequency resources
  • a scheduling constraint may occur due to insufficient radio resources for scheduling LTE terminals.
  • LTE traffic is excessively large
  • a scheduling constraint may occur due to insufficient radio resources for scheduling the 5G terminal.
  • radio resources for the NR PDCCH may be relatively insufficient compared to the NR PDSCH.
  • a cell to which DSS is applied (hereinafter, referred to as a DSS cell for convenience of description) and a 5G cell are 5G carrier aggregation.
  • a method for cross-carrier scheduling of a 5G cell to a DSS cell will be described.
  • the first embodiment describes a method of configuring a search space of an NR PDCCH when a DSS cell and a 5G cell are bundled with carriers and the 5G cell performs cross carrier scheduling of the DSS cell.
  • the number of CCEs required to transmit the NR PDCCH may be 1, 2, 4, 8, or 16 according to an aggregation level (AL), and the number of different CCEs is a link adaptation of a downlink control channel.
  • AL aggregation level
  • the terminal performs blind decoding of detecting a signal without knowing information about the downlink control channel.
  • a search space indicating a set of CCEs may be defined.
  • the search space is a set of downlink control channel candidates consisting of CCEs that the UE should attempt to decode on a given aggregation level, and various aggregations that make one bundle with 1, 2, 4, 8, 16 CCEs Since there is a level, the terminal may have a plurality of search spaces.
  • a search space set may be defined as a set of search spaces in all set aggregation levels.
  • the search space may be classified into a common search space (CSS) and a UE-specific search space (USS).
  • a group of terminals or all terminals may search the common search space of the NR PDCCH to receive cell common control information such as a dynamic scheduling or paging message for system information (System Information Blcok, SIB).
  • SIB System Information Blcok
  • the UE may receive scheduling assignment information of the NR PDSCH for system information reception by examining the common search space of the NR PDCCH.
  • the common search space since a certain group of terminals or all terminals must receive the NR PDCCH, it can be defined as a set of pre-arranged CCEs.
  • the UE-specific scheduling assignment information for the NR PDSCH or NR PUSCH may be received by the UE by examining the UE-specific search space of the NR PDCCH.
  • the UE-specific search space may be UE-specifically defined as a function of the UE's ID (Identity) and various system parameters.
  • the base station may configure the configuration information for the search space of the NR PDCCH to the terminal through higher layer signaling (eg, SIB, MIB, RRC signaling).
  • the base station is the number of NR PDCCH candidates in each aggregation level L, the monitoring period for the search space, the monitoring occasion in symbol units in the slot for the search space, and the search space type (common search space or terminal-specific search space) , a combination of a DCI format and an RNTI to be monitored in the corresponding search space, and a CORESET index for monitoring the search space may be set to the UE.
  • the parameter for the search space for the NR PDCCH may include information as shown in Table 6 below.
  • the base station may set one or a plurality of search space sets to the terminal.
  • the base station may set the search space set 1 and the search space set 2 to the terminal.
  • search space set 1 the UE may be configured to monitor DCI format A scrambled with X-RNTI in the common search space, and in search space set 2, the UE uses DCI format B scrambled with Y-RNTI in the UE-specific search space. It can be set to monitor in
  • one or a plurality of search space sets may exist in the common search space or the terminal-specific search space.
  • the search space set #1 and the search space set #2 may be set as the common search space
  • the search space set #3 and the search space set #4 may be set as the terminal-specific search space.
  • the UE may monitor the following DCI format and RNTI combination.
  • DCI format and RNTI combination Of course, it is not limited to the following examples.
  • the UE may monitor the following DCI format and RNTI combination.
  • DCI format and RNTI combination Of course, it is not limited to the following examples.
  • the RNTIs may follow the following definitions and uses.
  • C-RNTI Cell RNTI
  • Cell RNTI UE-specific PDSCH or PUSCH scheduling purpose
  • TC-RNTI Temporal Cell RNTI
  • CS-RNTI Configured Scheduling RNTI
  • RA-RNTI Random Access RNTI
  • P-RNTI Paging RNTI
  • SI-RNTI System Information RNTI
  • INT-RNTI Used to indicate whether PDSCH is pucturing
  • TPC-PUSCH-RNTI Transmit Power Control for PUSCH RNTI
  • TPC-PUCCH-RNTI Transmit Power Control for PUCCH RNTI
  • TPC-SRS-RNTI Transmit Power Control for SRS RNTI
  • the search space of the aggregation level L in the CORESET p in 5G and the search space set s can be expressed by the following equation.
  • the value may correspond to 0 in the case of a common search space.
  • the value may correspond to a value that changes depending on the terminal's ID (C-RNTI or ID set for the terminal by the base station) and the time index.
  • a method of configuring a search space of an NR PDCCH and a terminal operation are shown in Fig. 14 to 20 will be described.
  • the relationship between the common search space of NR PDCCH scheduling a given NR PDSCH/NR PUSCH and whether the cell in which the UE-specific search space is deployed is a PCell or an SCell is indicated by an arrow.
  • the first embodiment assumes that the 5G terminal recognizes the DSS cell as the PCell by connecting to the DSS cell through initial access, and then additionally configures the 5G cell as the SCell.
  • FIG. 14 is a diagram illustrating a search space after an initial access of a terminal in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 14 shows that a 5G terminal connects to a DSS cell (PCell) through initial access, and sets a common search space and a terminal-specific search space within the DSS cell.
  • 14 shows a state in which there is no search space for the SCell because the SCell has not yet been additionally set.
  • NR PDCCH search space configuration method 1 (a common search space and UE-specific search space of NR PDCCH for scheduling a PCell (DSS cell) are separated into PCell and SCell, respectively):
  • FIG. 15 is a diagram illustrating a method of configuring an NR PDCCH search space in a wireless communication system according to an embodiment of the present disclosure. That is, FIG. 15 shows method 1 of configuring an NR PDCCH search space.
  • the common search space is used for scheduling system information or paging messages, it is preferable to deploy and operate the PCell. Therefore, in the first embodiment, even if the SCell is cross-carrier scheduling the PCell, the common search space of the PCell can be deployed in the PCell (ie, the DSS cell) as it is.
  • the UE-specific search space of the PCell is moved to the SCell, and the aforementioned problem of insufficient radio resources for NR PDCCH in the DSS cell (PCell) can be solved.
  • the setting of the UE-specific search space and the CORESET setting of the PCell that is moved to the SCell may follow the SCell search space setting and the CORESET setting, respectively. Accordingly, there is no longer a UE-specific search space for a PCell in the PCell.
  • 16 is a diagram illustrating a method for a UE to monitor an NR PDCCH search space in a wireless communication system according to an embodiment of the present disclosure. That is, FIG.
  • step 16 shows a procedure for the UE to monitor the NR PDCCH according to method 1 of configuring the NR PDCCH search space.
  • the terminal is instructed to set the carrier bundle from the base station.
  • the carrier bundle configuration may include a configuration in which the SCell performs cross-carrier scheduling of the PCell.
  • the terminal may perform NR PDCCH monitoring in step 1602 .
  • the terminal searches the common search space for PCell in the PCell and searches ⁇ the terminal-specific search space for PCell, the terminal-specific search space for SCell ⁇ in the SCell.
  • the setting of the UE-specific search space for the PCell and the CORESET setting that the UE investigates in the SCell may follow the setting of the UE-specific search space for the SCell and the CORESET setting.
  • the UE may receive the NR PDSCH or transmit the NR PUSCH according to the scheduling of the successfully received NR PDCCH.
  • NR PDCCH search space configuration method 2 (the common search space of the NR PDCCH for scheduling a PCell (DSS cell) and the UE-specific search space are not separately arranged, but are all deployed as SCells):
  • FIG. 17 is a diagram illustrating another method of configuring an NR PDCCH search space in a wireless communication system according to an embodiment of the present disclosure. That is, FIG. 17 shows method 2 of configuring an NR PDCCH search space.
  • Method 2 of configuring the NR PDCCH search space solves the problem of insufficient radio resources for the NR PDCCH within the DSS cell (PCell) by moving and disposing all of them to the SCell regardless of whether the search space for the PCell is a common search space or a UE-specific search space. can do.
  • the setting of the search space and the CORESET setting of the PCell moved to the SCell may follow the setting of the SCell search space and the CORESET setting, respectively.
  • Method 2 of configuring the NR PDCCH search space can more actively solve the problem of insufficient NR PDCCH radio resources in the DSS cell (PCell) compared to Method 1 of configuring the NR PDCCH search space.
  • FIG. 18 is a diagram illustrating another method for a UE to monitor an NR PDCCH search space in a wireless communication system according to an embodiment of the present disclosure. That is, FIG. 18 shows a procedure for the UE to monitor the NR PDCCH according to method 2 of configuring the NR PDCCH search space.
  • the terminal is instructed to set the carrier bundle from the base station.
  • the carrier bundle configuration may include a configuration in which the SCell performs cross-carrier scheduling of the PCell.
  • the terminal may perform NR PDCCH monitoring in step 1802.
  • the UE may search ⁇ common search space for PCell, UE-specific search space for PCell, UE-specific search space for SCell ⁇ in SCell according to method 2 of configuring the NR PDCCH search space.
  • the configuration of the search space for the PCell and the CORESET configuration that the terminal investigates in the SCell may follow the configuration of the terminal-specific search space for the SCell and the CORESET configuration.
  • the UE may receive the NR PDSCH or transmit the NR PUSCH according to the scheduling of the successfully received NR PDCCH.
  • NR PDCCH search space configuration method 3 (a common search space of NR PDCCH for scheduling a PCell (DSS cell) and a UE-specific search space are arranged in the PCell, and a UE-specific search space of NR PDCCH for additionally scheduling the PCell) to the SCell):
  • FIG. 19 is a diagram illustrating another method of configuring an NR PDCCH search space in a wireless communication system according to an embodiment of the present disclosure. That is, FIG. 19 shows method 3 of configuring an NR PDCCH search space.
  • Method 3 of configuring the NR PDCCH search space may include a method of additionally setting the UE-specific search space for the PCell in the SCell while maintaining the common search space for PCell and the UE-specific search space for PCell as they are before carrier bundle. .
  • the setting of the UE-specific search space and the CORESET setting of the PCell additionally configured in the SCell may follow the setting of the SCell search space and the CORESET setting, respectively.
  • the UE-specific search space for PCell is arranged in both the PCell and the SCell, so that even if either one of the PCell and the SCell radio link is unstable, the NR PDCCH for the PCell is transmitted through the search space of the other stable radio link.
  • FIG. 20 is a diagram illustrating another method for a UE to monitor an NR PDCCH search space in a wireless communication system according to an embodiment of the present disclosure. That is, FIG. 20 shows a procedure for the UE to monitor the NR PDCCH according to method 3 of configuring the NR PDCCH search space.
  • the terminal is instructed to set the carrier bundle from the base station.
  • the carrier bundle configuration may include a configuration in which the SCell performs cross-carrier scheduling of the PCell.
  • the terminal may perform NR PDCCH monitoring in step 2002 .
  • the terminal searches ⁇ common search space for PCell, terminal-specific search space for PCell ⁇ in PCell, and ⁇ terminal-specific search space for PCell, terminal-specific for SCell ⁇ in SCell. search space ⁇ .
  • the setting of the search space for the PCell and the CORESET setting that the UE investigates in the SCell may follow the setting of the UE-specific search space for the SCell and the CORESET setting.
  • the UE may receive the NR PDSCH or transmit the NR PUSCH according to the scheduling of the successfully received NR PDCCH.
  • the base station informs the terminal of which method to use among methods 1, 2, and 3 for setting the search space and CORESET for the PCell in the SCell through signaling.
  • the NR PDCCH search space configuration method 2 is to be understood as a concept of “PCell change (PCell switch)” in which an existing PCell is converted to an SCell while a carrier bundle is set to the UE and a newly added SCell is converted to a PCell.
  • PCell change PCell switch
  • the terminal may transmit the PUCCH for transmitting the uplink control information UCI to the base station through the newly switched PCell.
  • an additional procedure related to the HARQ operation of the NR PDSCH / NR PUSCH of the PCell may be required.
  • the NR PDCCH scheduling the initial transmission of the NR PDSCH of the PCell is mapped to the search space for the PCell of the SCell and transmitted, and the NR PDCCH scheduling the retransmission of the NR PDSCH of the PCell is mapped to the search space for the PCell of the PCell. may be transmitted (or vice versa).
  • the base station sets the HARQ process ID of the NR PDCCH for scheduling the initial transmission and the HARQ process ID of the NR PDCCH for scheduling the retransmission to the same value, so that the same NR It indicates that it is scheduling for PDSCH (or NR PUSCH).
  • the base station maintains the same cell as the transmitted cell by mapping the NR PDCCH for scheduling the initial transmission and the transmitting cell by mapping the NR PDCCH for scheduling the retransmission. Therefore, the UE expects that the NR PDCCH scheduling the same NR PDSCH (or NR PUSCH) will be transmitted in the same cell regardless of initial transmission or retransmission, and if not, it is recognized as an error condition.
  • the NR PDCCH mapped to the UE-specific search space and transmitted is a common search space
  • the following operation may be defined according to whether it can be mapped to .
  • the carrier bundle is not set, the amount of radio resources occupied by the search space can be managed without being excessive by allowing the above operation.
  • the QCL relationship of the NR PDCCH for each cell is defined.
  • the base station may configure and indicate the TCI state for the NR PDCCH (or NR PDCCH DMRS) through appropriate signaling.
  • the TCI state is for announcing a QCL (Quasi co-location) relationship between NR PDCCH (or NR PDCCH DMRS) and other RS or channels, and a certain reference antenna port A (reference RS #A) and another destination antenna port B ( To say that target RS #B) are QCLed to each other (QCLed) means that the terminal is allowed to apply some or all of the large-scale channel parameters estimated from the antenna port A to the channel measurement from the antenna port B.
  • QCL Quality of Physical channels
  • QCL is 1) time tracking affected by average delay and delay spread of wireless channel, 2) frequency tracking affected by Doppler shift and Doppler spread, 3) RRM (radio resource management) affected by average gain, 4)
  • RRM radio resource management
  • BM beam management
  • Table 8 four types of QCL relationships as shown in Table 8 below can be supported.
  • the spatial RX parameter includes various parameters such as Angle of arrival (AoA), Power Angular Spectrum (PAS) of AoA, Angle of departure (AoD), PAS of AoD, transmit/receive channel correlation, transmit/receive beamforming, spatial channel correlation, etc. Some or all of them may be collectively referred to.
  • AoA Angle of arrival
  • PAS Power Angular Spectrum
  • AoD Angle of departure
  • PAS PAS of AoD
  • transmit/receive channel correlation transmit/receive beamforming
  • spatial channel correlation etc.
  • the QCL relationship may be set to the UE through TCI-State and QCL-Info, which are RRC parameters, as shown in Table 9 below.
  • the base station sets one or more TCI states to the UE and informs the UE of up to two QCL relationships (qcl-Type1, qcl-Type2) for the RS referring to the ID of the TCI state, that is, the target RS.
  • each QCL information (QCL-Info) included in each of the TCI states is the serving cell index and BWP index of the reference RS indicated by the QCL information, the type and ID of the reference RS, and the QCL type as shown in ⁇ Table 8>.
  • a hierarchical signaling method may be supported for dynamic allocation of the NR PDCCH beam.
  • the base station may set N TCI states to the terminal through RRC signaling, and some of them may be set as TCI states for CORESET. Thereafter, the base station may indicate one of the TCI states for CORESET to the terminal through MAC CE signaling.
  • the UE may receive the NR PDCCH based on beam information included in the TCI state indicated by the MAC CE signaling.
  • the TCI indication MAC CE signaling for the NR PDCCH DMRS consists of 2 bytes (16 bits), and 1 bit reserved bit, 5 bit serving cell ID, 2 bit BWP ID, 2 bit CORESET ID and 6 bit TCI State ID may be included.
  • the base station may set one or a plurality of TCI states for a specific CORESET to the terminal, and may activate one of the set TCI states through a MAC CE activation command. For example, ⁇ TCI state#0, TCI state#1, TCI state#2 ⁇ is set as the TCI state in CORESET#1, and the base station uses TCI state#0 as the TCI state for CORESET#1 through MAC CE. It is possible to transmit a command for activating the assumption to the terminal. Based on the activation command for the TCI state received by the MAC CE, the UE may correctly receive the DMRS of the corresponding CORESET based on QCL information in the activated TCI state.
  • CORESET CORESET#0
  • the UE responds to the DMRS transmitted from CORESET#0, the initial access procedure
  • it may be assumed that it is QCL with the SS/PBCH block identified in a non-contention-based random access process that is not triggered by the NR PDCCH command.
  • CORESET#X For CORESET (CORESET#X) in which the index is set to a value other than 0, if the UE did not set the TCI state for CORESET#X, or received one or more TCI states set, MAC CE activation that activates one of them If the command is not received, the UE may assume that it is QCLed with the SS/PBCH block identified in the initial access process with respect to the DMRS transmitted in CORESET#X.
  • the common search space for the PCell and the terminal-specific search space for the PCell may exist separately in the PCell and the SCell (ie, NR PDCCH search space configuration methods 1 and 3), the frequency difference between the PCell and the SCell, etc.
  • QCL characteristics may also differ between PCell and SCell due to the influence of . Therefore, in this case, it is necessary to independently operate the QCL setting of the common search space and the QCL setting of the UE-specific search space.
  • the base station may notify the terminal of QCL configuration information of the common search space and QCL configuration information of the terminal-specific search space, respectively, to the terminal by signaling.
  • the base station may notify the terminal of QCL configuration information of CORESET in which the common search space is defined and QCL configuration information of CORESET in which the terminal-specific search space is defined, respectively, to the terminal by signaling.
  • the QCL of the NR PDCCH assumed by the UE as a default is limited to reference from among the available QCLs of the cell in which the NR PDCCH is transmitted.
  • the UE monitors the NR PDCCH scheduling the NR PDSCH of the PCell in the SCell if the UE does not receive a MAC CE activation command for activating the TCI state of the CORESET to which the NR PDCCH is mapped, the UE does not receive the CORESET For the DMRS transmitted in , the QCL of the most recently recognized NR PDCCH for the SCell may be assumed. That is, unlike the existing 5G system, the UE may not determine that the UE is QCL with the SS/PBCH block of the PCell identified in the initial access process.
  • the third embodiment describes a configuration procedure for bundling a DSS cell and a 5G cell with a 5G carrier and for the 5G cell to cross-carrier scheduling the DSS cell.
  • an operation of setting a carrier bundle to the terminal will be described with reference to FIG. 21 .
  • 21 is a diagram illustrating a procedure for setting a carrier bundle in a wireless communication system according to an embodiment of the present disclosure.
  • the terminal 2100 performs initial access to the base station 2101 .
  • the UE may synchronize downlink time and frequency from a synchronization signal transmitted by the base station through cell search and obtain a cell ID.
  • the UE may receive a PBCH (Physical Broadcast Channel) by using the obtained cell ID, and may obtain MIB (Master Information Block), which is essential system information, from the PBCH.
  • the terminal may receive system information (SIB) transmitted by the base station to obtain control information related to transmission and reception common to cells.
  • SIB system information
  • the cell common transmission/reception related control information may include random access related control information, paging related control information, common control information for various physical channels, and the like.
  • the cell accessed by the UE in step 2104 may mean a PCell.
  • step 2105 the terminal performs random access to the base station by using the random access related control information obtained from the system information.
  • the terminal that has successfully completed the random access procedure may synchronize uplink time with the base station.
  • one-to-one communication between the base station and the terminal may be enabled by switching the terminal to a connected state.
  • the terminal performs data transmission and reception with the base station through the PCell.
  • the terminal may report UE capability information to the base station to inform the base station of whether the terminal itself supports a predetermined function, the maximum allowable value of the function supported by the terminal, and the like.
  • the UE capability information may include whether the terminal supports a carrier bundle and information related to the carrier bundle.
  • the UE may perform a measurement report on neighboring cells. For example, when the received signal strength from neighboring cells observed by the terminal is greater than a predetermined threshold, the ID and the received signal strength of the corresponding cell may be included in the measurement report and transmitted to the base station.
  • the reference signal observed by the UE for measurement report may be an SS/PBCH block or CSI-RS transmitted by a neighboring cell.
  • the base station may inform the terminal of control information for the measurement report of the terminal through signaling.
  • the control information for the measurement report of the terminal may include at least a part of control information related to the following.
  • the base station may determine whether to set a carrier bundle for the terminal or to instruct handover to another cell with reference to the measurement report of the terminal.
  • the determination of whether to set the carrier bundle may mean determining whether to combine, for example, an additional carrier (SCell) with the PCell of the current terminal.
  • SCell additional carrier
  • the base station may transmit related information necessary for SCell association of the terminal to the terminal by including in an 'RRC reconfiguration' message.
  • the related information necessary for the carrier bundle may include carrier bandwidth and center frequency information of the SCell, common control information for a physical channel of the SCell, and the like.
  • the UE completes a process for communicating with the SCell according to the received 'RRC reconfiguration' message, and then transmits a 'RRC reconfiguration complete' message to the base station in step 2108.
  • the terminal is in a state of complete preparation to perform data transmission and reception with both the PCell and the SCell of the base station.
  • Table 10 below shows various steps in which the terminal sets and releases the carrier bundle from the initial access.
  • Case 1 is the stage from the initial access stage of the UE to the stage before the execution of the subsequent carrier bundle, and the UE supports only the self carrier scheduling operation. Accordingly, the UE determines scheduling for the PCell by monitoring the NR PDCCH transmitted from the PCell.
  • Case 2 is an SCell addition step, and the base station instructs the UE to perform carrier bundling by adding a predetermined SCell.
  • the base station configures SCell addition to the terminal by RRC signaling.
  • RRC signaling for SCell addition includes cross carrier scheduling configuration information in Table 11 below.
  • RRC signaling for SCell addition is included in the 'RRC reset' message described with reference to FIG. 21 .
  • the base station may inform the terminal by adding the following signaling to the cross carrier scheduling configuration information whether the PCell is cross carrier scheduling from the SCell.
  • PCell ID is indicated as index (“scheduledCellId”) information of a scheduled cell in which NR PDSCH / NR PUSCH scheduled by NR PDCCH are transmitted, or
  • Table 12 shows a specific example of cross carrier scheduling configuration information including signaling 1 or signaling 2 described above.
  • PcellCrossCarrierScheduling in Table 12 below, whether the PCell is cross-carrier scheduling from the SCell (“enabled”) or whether the PCell is not cross-carrier scheduling from the SCell (“disabled”) can be indicated.
  • cif-InSchedulingCell” information in “PcellCrossCarrierScheduling” may indicate a CIF (carrier indicator field) value to be used by including in DCI when the SCell performs cross carrier scheduling of the PCell.
  • CIF carrier indicator field
  • the UE determines scheduling for the PCell by monitoring the NR PDCCH transmitted from the PCell.
  • case 2 whether the PCell is cross-carrier scheduling from the SCell in RRC signaling for SCell addition is set, but as a modified example of case 2, a method of changing the existing setting of the PCell may also be possible.
  • the cross-carrier scheduling configuration information of Table 11 described above may be included in the configuration information of the PCell, and in the SCell addition step, whether the PCell is cross-carrier scheduling from the SCell may be updated.
  • Case 3 is an SCell activation step, in which the base station instructs SCell activation to the terminal that has completed the SCell configuration through the SCell addition.
  • the UE monitors the NR PDCCH for scheduling the corresponding SCell, and performs operations such as SRS transmission, CSI reporting, and PUCCH transmission in the SCell uplink.
  • the base station may inform the terminal of SCell activation by MAC signaling or physical layer signaling.
  • the base station may include in the SCell activation signaling whether the PCell is cross-carrier scheduling from the SCell. If the SCell addition step has already notified whether the PCell is cross-carrier scheduling from the SCell, control information on whether the PCell is cross-carrier scheduling from the SCell may be omitted from the SCell activation signaling.
  • the UE determines the scheduling for the PCell by monitoring the NR PDCCH transmitted from the SCell (the NR PDCCH search space configuration method 2) or the PCell and NR PDCCH transmitted from the SCell are monitored and determined (NR PDCCH search space configuration methods 1 and 3).
  • Case 4 is an SCell deactivation step, and the currently activated SCell is converted to a deactivated state.
  • the SCell When the SCell is deactivated, the UE does not monitor the NR PDCCH for scheduling the corresponding SCell, and does not perform operations such as SRS transmission, CSI reporting, and PUCCH transmission in the SCell uplink.
  • the base station may inform the terminal of SCell deactivation through MAC signaling or physical layer signaling.
  • the terminal determines the scheduling for the PCell by monitoring the NR PDCCH transmitted from the PCell.
  • Case 5 is an SCell release step, and the base station instructs the UE to release the current SCell from the carrier bundling operation.
  • the base station sets SCell release to the terminal by RRC signaling. Similar to the SCell deactivation step, the UE determines the scheduling for the PCell by monitoring the NR PDCCH transmitted from the PCell.
  • Handover step to change the serving cell of the UE Whether to set carrier bundle after handover, whether to set cross carrier scheduling, whether to set PCell to SCell cross carrier scheduling
  • the base station may indicate to the terminal by including it in the handover command.
  • the following operation is also possible.
  • the terminal determines the scheduling for the PCell without an additional SCell activation command by monitoring the NR PDCCH transmitted from the SCell (the NR PDCCH discovery) Spatial configuration method 2) or it can be determined by monitoring the NR PDCCH transmitted from the PCell and the SCell, respectively (NR PDCCH search space configuration methods 1 and 3).
  • the UE may not perform it before SCell activation, but may perform it in the corresponding SCell after SCell activation.
  • SCell activation SCell activation, Case 3
  • SCell deactivation SCell deactivation
  • the base station may instruct the terminal to proceed with the carrier bundling operation by adding a predetermined SCell (SCell addition).
  • SCell addition a predetermined SCell
  • the base station may inform the terminal whether the PCell is cross-carrier scheduling from the SCell.
  • the base station sets the PCell to cross carrier scheduling from the SCell through the SCell addition operation to the terminal.
  • method 1 of configuring the NR PDCCH search space may be assumed.
  • the terminal may receive an SCell activation command 2504 from the base station in slot n 2503 .
  • the UE may complete the SCell activation in slot n+k1 2505 after a predetermined processing time k1 for processing the SCell activation command.
  • the UE may investigate the common search space of the PCell and the UE-specific search space of the PCell in the PCell in order to obtain the NR PDCCH scheduling the PCell (2506, 2507). ). And from slot n+k1 where SCell activation is completed, the UE investigates the common search space of the PCell in the PCell to obtain the NR PDCCH scheduling the PCell (2508), and the UE-specific search space of the PCell in the SCell. There are (2509). In addition, the UE may investigate the UE-specific search space of the SCell in the SCell to obtain an NR PDCCH scheduling the SCell (2509).
  • the UE may investigate the UE-specific space of the PCell in the PCell even after the slot n+k1 in which the SCell activation is completed. That is, the UE may investigate the UE-specific space of the PCell in the PCell and the SCell after slot n+k1, respectively.
  • the UE may search the common search space of the PCell in the PCell regardless of whether the SCell is activated.
  • the base station sets the PCell to cross carrier scheduling from the SCell through the SCell addition operation and the SCell activation command to the terminal.
  • the NR PDCCH search space configuration method 1 may be assumed.
  • the terminal may receive an SCell deactivation command 2604 from the base station in slot n 2603 .
  • the UE may complete the SCell deactivation in slot n+k2 2605 after a predetermined processing time k2 for processing the SCell deactivation command. Therefore, before the completion of SCell deactivation, until slot n+k2, the UE may search the common search space of the PCell in the PCell to acquire the NR PDCCH for scheduling the PCell (2606).
  • the UE searches the UE-specific search space of the PCell in the SCell to obtain the NR PDCCH scheduling the PCell, and the UE-specific search space of the SCell to obtain the NR PDCCH scheduling the SCell. can be investigated (2609). And after the slot n+k2 where SCell deactivation is completed, the UE can investigate the common search space of the PCell in the PCell to obtain the NR PDCCH for scheduling the PCell (2607), and investigate the UE-specific search space of the PCell in the PCell Can (2608). In addition, the UE may no longer investigate the NR PDCCH scheduling the SCell.
  • the UE may investigate the UE-specific space of the PCell in the PCell and the SCell, respectively, before slot n+k2 before the SCell deactivation is completed.
  • the UE in both the NR PDCCH search space configuration method 1 and the NR PDCCH search space configuration method 3, the UE can investigate the common search space of the PCell in the PCell regardless of whether the SCell is deactivated.
  • FIG. 22 is a diagram illustrating an apparatus for transmitting and receiving a terminal in a wireless communication system according to an embodiment of the present disclosure. For convenience of description, illustration and description of devices not directly related to the present disclosure may be omitted.
  • the terminal includes a transmitter 2204 including an uplink transmission processing block 2201 , a multiplexer 2202 , and a transmission RF block 2203 , a downlink reception processing block 2205 , and a demultiplexer 2206 . ), it may be composed of a receiving unit 2208 and a control unit 2209 composed of a receiving RF block 2207 . As described above, the controller 2209 controls each of the constituent blocks of the receiving unit 2208 for reception of a data channel or a control channel transmitted by the base station and each of the constituent blocks of the transmitting unit 2204 for transmitting an uplink signal. can do.
  • the uplink transmission processing block 2201 in the transmitter 2204 of the terminal may generate a signal to be transmitted by performing a process such as channel coding and modulation.
  • the signal generated by the uplink transmission processing block 2201 may be multiplexed with other uplink signals by the multiplexer 2202 and then signal-processed in the transmission RF block 2203 and then transmitted to the base station.
  • the reception unit 2208 of the terminal demultiplexes the signal received from the base station and distributes it to each downlink reception processing block.
  • the downlink reception processing block 2205 may obtain control information or data transmitted from the base station by performing processes such as demodulation and channel decoding on the downlink signal of the base station.
  • the terminal receiver 2208 may support the operation of the controller 2209 by applying the output result of the downlink reception processing block to the controller 2209 .
  • FIG. 23 is a block diagram illustrating the configuration of a terminal according to an embodiment of the present disclosure.
  • the terminal of the present disclosure may include a processor 2330 , a transceiver 2310 , and a memory 2320 .
  • the components of the terminal are not limited to the above-described example.
  • the terminal may include more or fewer components than the aforementioned components.
  • the processor 2330 , the transceiver 2310 , and the memory 2320 may be implemented in the form of a single chip.
  • the transceiver 2310 of FIG. 23 may include the transmitter 2204 and the receiver 2208 of FIG. 22 .
  • the processor 2330 of FIG. 23 may include the controller 2209 of FIG. 22 .
  • the processor 2330 may control a series of processes in which the terminal may operate according to the above-described embodiment of the present disclosure.
  • the components of the terminal may be controlled to perform the method of transmitting and receiving the terminal.
  • There may be a plurality of processors 2330, and the processor 2330 executes a program stored in the memory 2320 to perform transmission/reception of a terminal in a wireless communication system to which the carrier bundle of the present disclosure is applied.
  • the transceiver 2310 may transmit/receive a signal to/from the base station.
  • a signal transmitted and received with the base station may include control information and data.
  • the transceiver 2310 may include an RF transmitter for up-converting and amplifying a frequency of a transmitted signal, and an RF receiver for low-noise amplifying and down-converting a received signal.
  • the transceiver 2310 is only an example, and the components of the transceiver 2310 are not limited to the RF transmitter and the RF receiver.
  • the transceiver 2310 may receive a signal through a wireless channel, output it to the processor 2330 , and transmit a signal output from the processor 2330 through a wireless channel.
  • the memory 2320 may store programs and data necessary for the operation of the terminal.
  • the memory 2320 may store control information or data included in a signal transmitted and received by the terminal.
  • the memory 2320 may be configured as a storage medium or a combination of storage media, such as ROM, RAM, hard disk, CD-ROM, and DVD.
  • the number of memories 2320 may be plural.
  • the memory 2320 stores a program for performing a transmission/reception operation of a terminal in a wireless communication system to which a carrier bundle, which is the above-described embodiments of the present disclosure, is applied. can
  • 24 is a block diagram illustrating a configuration of a base station according to an embodiment of the present disclosure.
  • the base station of the present disclosure may include a processor 2430 , a transceiver 2410 , and a memory 2420 .
  • the components of the base station are not limited to the above-described example.
  • the base station may include more or fewer components than the aforementioned components.
  • the processor 2430 , the transceiver 2410 , and the memory 2420 may be implemented in the form of a single chip.
  • the processor 2430 may control a series of processes so that the base station can operate according to the above-described embodiment of the present disclosure. For example, components of a base station may be controlled to perform a method for scheduling a terminal in a mobile communication system supporting a carrier bundle according to an embodiment of the present disclosure. There may be a plurality of processors 2430, and the processor 2430 executes a program stored in the memory 2420 to perform a method of scheduling a terminal in a mobile communication system supporting the carrier bundle of the present disclosure as described above.
  • the transceiver 2410 may transmit/receive a signal to/from the terminal.
  • a signal transmitted and received with the terminal may include control information and data.
  • the transceiver 2410 may include an RF transmitter for up-converting and amplifying a frequency of a transmitted signal, and an RF receiver for low-noise amplifying and down-converting a received signal.
  • the transceiver 2410 is only an exemplary embodiment, and components of the transceiver 2410 are not limited to the RF transmitter and the RF receiver.
  • the transceiver 2410 may receive a signal through a wireless channel and output it to the processor 2430 , and transmit a signal output from the processor 2430 through a wireless channel.
  • the memory 2420 may store programs and data necessary for the operation of the base station. Also, the memory 2420 may store control information or data included in a signal transmitted and received by the base station.
  • the memory 2420 may be configured as a storage medium or a combination of storage media, such as ROM, RAM, hard disk, CD-ROM, and DVD. Also, the number of memories 2420 may be plural.
  • the memory 2420 may store a program for performing the method of scheduling a terminal in a mobile communication system supporting carrier bundles, which are the above-described embodiments of the present disclosure.
  • a method of operating a terminal in a wireless communication system receives, from a base station, configuration information related to carrier aggregation (CA), and the configuration information related to the carrier aggregation is , including information related to cross carrier scheduling between a PCell (primary cell) and a secondary cell (SCell), performing configuration related to a carrier bundle based on the configuration information related to the carrier bundle; monitoring a common search space (CSS) of the PCell on the PCell, and monitoring a UE-specific search space (USS) of the SCell on the SCell based on the performed carrier bundle-related configuration, and in the monitoring based on the PDCCH.
  • CA carrier aggregation
  • SCS common search space
  • USS UE-specific search space
  • the method of operating the terminal may further include monitoring the USS of the PCell on the PCell based on the performed carrier bundle-related configuration.
  • a search space configuration for the USS of the PCell monitored on the SCell is determined based on a search space configuration for the USS of the SCell monitored on the SCell, and monitoring on the SCell
  • a control resource set (CORESET) setting for the USS of the PCell may be determined based on a CORESET setting for the USS of the SCell monitored on the SCell.
  • the method of operating the terminal includes information related to a search space setting for the USS of the PCell monitored on the SCell and a control resource set (CORESET) setting related to the USS of the PCell. It may include receiving information from the base station through radio resource signal (RRC) signaling.
  • RRC radio resource signal
  • the information related to cross-carrier scheduling between the PCell and the SCell includes an indicator indicating whether the PCell is cross-carrier scheduled by the SCell, and when the PCell is cross-carrier scheduled by the SCell , information related to cross-carrier scheduling between the PCell and the SCell may include a carrier indicator field (CIF) value.
  • CIF carrier indicator field
  • the indicator indicates that the PCell is cross-carrier scheduled by the SCell
  • receiving a command message related to SCell activation from the base station Step monitoring the CSS of the PCell and the USS of the PCell on the PCell from the slot in which the command message related to the SCell activation is received to the slot in which the SCell activation is completed, and a predetermined value after the slot in which the SCell activation is completed up to a slot, monitoring the CSS of the PCell on the PCell, and monitoring at least one of the USS of the PCell or the USS of the SCell on the SCell.
  • the method of operating the terminal includes receiving, from the base station, a command message related to SCell deactivation when the indicator indicates that the PCell is cross-carrier scheduled by the SCell. Step, from the slot receiving the command message related to the SCell deactivation to the slot where the SCell deactivation is completed, monitoring the CSS of the PCell on the PCell, and monitoring the USS of the PCell and the USS of the SCell on the SCell, and monitoring the CSS of the PCell and the USS of the PCell on the PCell from after the slot in which the SCell deactivation is completed to a predetermined slot.
  • the information related to cross-carrier scheduling between the PCell and the SCell does not include an indicator indicating whether the PCell is cross-carrier scheduled by the SCell, from the base station , receiving an SCell activation message including information on whether the PCell is cross-carrier scheduled by the SCell.
  • a terminal receives configuration information related to a carrier aggregation (CA) from a base station through a transceiver and the transceiver, and the carrier
  • the configuration information related to the bundle includes information related to cross carrier scheduling between a PCell (primary cell) and a secondary cell (SCell), and based on the configuration information related to the carrier bundle, the configuration related to the carrier bundle and monitoring a common search space (CSS) of the PCell on the PCell, and monitoring a UE-specific search space (USS) of the SCell on the SCell based on the performed carrier bundle-related configuration, and It may include at least one processor that receives the PDCCH based on the monitoring through the transceiver.
  • CCS common search space
  • USS UE-specific search space
  • the at least one processor may monitor the USS of the PCell on the PCell based on the configuration related to the performed carrier bundle.
  • a search space configuration for the USS of the PCell monitored on the SCell is determined based on a search space configuration for the USS of the SCell monitored on the SCell, and monitoring on the SCell
  • a control resource set (CORESET) setting for the USS of the PCell may be determined based on a CORESET setting for the USS of the SCell monitored on the SCell.
  • the information related to cross-carrier scheduling between the PCell and the SCell includes an indicator indicating whether the PCell is cross-carrier scheduled by the SCell, and when the PCell is cross-carrier scheduled by the SCell , information related to cross-carrier scheduling between the PCell and the SCell may include a carrier indicator field (CIF) value.
  • CIF carrier indicator field
  • the at least one processor when the indicator indicates that the PCell is cross-carrier scheduled by the SCell, via the transceiver, from the base station, a command related to SCell activation (command) ) message, monitoring the CSS of the PCell and the USS of the PCell on the PCell from the slot in which the command message related to the SCell activation is received to the slot in which the SCell activation is completed, and after the slot in which the SCell activation is completed Up to a predetermined slot, the CSS of the PCell may be monitored on the PCell, and at least one of the USS of the PCell or the USS of the SCell may be monitored on the SCell.
  • command command related to SCell activation
  • the at least one processor when the indicator indicates that the PCell is cross-carrier scheduled by the SCell, via the transceiver, from the base station, a command related to SCell deactivation (command) ) message and monitor the CSS of the PCell on the PCell from the slot where the command message related to the SCell deactivation is received to the slot where the SCell deactivation is completed, and the USS of the PCell and the USS of the SCell on the SCell and monitoring the CSS of the PCell and the USS of the PCell on the PCell from after the slot in which the SCell deactivation is completed to a predetermined slot.
  • a command related to SCell deactivation (command) ) message and monitor the CSS of the PCell on the PCell from the slot where the command message related to the SCell deactivation is received to the slot where the SCell deactivation is completed, and the USS of the PCell and the USS of the SCell on the SCell and monitoring the CSS of the PCell and the USS of the PCell on the PC
  • the at least one processor when the information related to cross-carrier scheduling between the PCell and the SCell does not include an indicator indicating whether the PCell is cross-carrier scheduled by the SCell, the transceiver unit Through this, an SCell activation message including information on whether the PCell is cross-carrier scheduled by the SCell may be received from the base station.
  • a computer-readable storage medium or computer program product storing one or more programs (software modules) may be provided.
  • One or more programs stored in a computer-readable storage medium or computer program product are configured for execution by one or more processors in an electronic device (device).
  • One or more programs include instructions for causing an electronic device to execute methods according to embodiments described in a claim or specification of the present disclosure.
  • Such programs include random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable ROM (EEPROM: Electrically Erasable Programmable Read Only Memory), magnetic disc storage device, Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or any other form of It may be stored in an optical storage device or a magnetic cassette. Alternatively, it may be stored in a memory composed of a combination of some or all thereof. In addition, each configuration memory may be included in plurality.
  • the program accesses through a communication network composed of a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination thereof. It may be stored in an attachable storage device that can be accessed. Such a storage device may be connected to a device implementing an embodiment of the present disclosure through an external port. In addition, a separate storage device on the communication network may be connected to the device implementing the embodiment of the present disclosure.
  • a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination thereof. It may be stored in an attachable storage device that can be accessed.
  • Such a storage device may be connected to a device implementing an embodiment of the present disclosure through an external port.
  • a separate storage device on the communication network may be connected to the device implementing the embodiment of the present disclosure.
  • the term "computer program product” or “computer readable medium” refers to a medium such as a memory, a hard disk installed in a hard disk drive, and a signal as a whole. used for These "computer program products” or “computer-readable recording medium” are means provided for a method of transmitting and receiving a terminal in a wireless communication system to which a carrier wave bundle according to the present disclosure is applied.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un dispositif pour l'émission et la réception d'un signal dans un système de communication sans fil. Le procédé d'exploitation pour un équipement d'utilisateur dans un système de communication sans fil, peut comprendre les étapes suivantes : recevoir des informations de configuration relatives à l'agrégation de porteuses (CA) d'une station de base, les informations de configuration relatives à la CA comprenant des informations relatives à la planification de porteuses croisées entre une cellule primaire (PCell) et une cellule secondaire (SCell) ; exécuter la configuration relative à la CA sur la base des informations de configuration relatives à la CA ; surveiller, sur la cellule PC, un espace de recherche commun (CSS) de la cellule PC, et surveiller, sur la cellule SC, un espace de recherche spécifique à l'UE (USS) de la cellule SC, la cellule PC et la cellule SC étant surveillées sur la base de la configuration exécutée liée à CA ; et recevoir un PDCCH sur la base de la surveillance.
PCT/KR2021/005471 2020-06-02 2021-04-29 Procédé et dispositif d'émission et de réception d'un signal dans un système de communication sans fil WO2021246653A1 (fr)

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US17/928,825 US20230217452A1 (en) 2020-06-02 2021-04-29 Method and device for transmitting and receiving signal in wireless communication system
CN202180040023.3A CN115769531A (zh) 2020-06-02 2021-04-29 用于在无线通信***中发送和接收信号的方法和装置

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KR10-2020-0066695 2020-06-02
KR20200066695 2020-06-02
KR20200091279 2020-07-22
KR10-2020-0091279 2020-07-22
KR10-2020-0137762 2020-10-22
KR1020200137762A KR20210149573A (ko) 2020-06-02 2020-10-22 무선 통신 시스템에서 신호를 송수신하는 방법 및 장치

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US20220232597A1 (en) * 2021-01-20 2022-07-21 Qualcomm Incorporated Techniques for cross-carrier scheduling with multi-transmission and reception points and dynamic spectrum sharing
US20230008060A1 (en) * 2021-07-06 2023-01-12 Qualcomm Incorporated Throughput-based component carrier resource allocation for multiple subscriptions of a user equipment

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WO2016048111A2 (fr) * 2014-09-27 2016-03-31 엘지전자 주식회사 Procédé de surveillance mis en œuvre par un terminal dans un système de communication sans fil prenant en charge une agrégation de porteuses, et dispositif associé
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WO2020001225A1 (fr) * 2018-06-29 2020-01-02 维沃移动通信有限公司 Procédé et dispositif d'attribution de pdcch candidat par ordonnancement entre porteuses

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WO2014062041A1 (fr) * 2012-10-21 2014-04-24 엘지전자 주식회사 Procédé et dispositif de surveillance de canal de commande de liaison descendante dans un système de communication sans fil
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WO2016048111A2 (fr) * 2014-09-27 2016-03-31 엘지전자 주식회사 Procédé de surveillance mis en œuvre par un terminal dans un système de communication sans fil prenant en charge une agrégation de porteuses, et dispositif associé
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